i need to buy wheel spacers for my 93 se but on the h&r website it said that there could be two different sizes of studs..

"15) Depending on model, axle, and year, Nissan vehicles have different diameters in the shoulder of the studs. The following list provides notes and measurements of the shoulder of the studs required for installation. The wheel spacers shown in the catalog will be supplied with shoulder bolts D=14.15. If you need D=12.85, please add a "1" at the end of the part number."

does anyone know what size studs i need to use?
thanks